Polymer composition for highly disintegratable film

Patent metadata

Field	Value
Publication number	US-10988587-B2
Application number	US-201816487671-A
Country	US
Kind code	B2
Filing date	Feb 27, 2018
Priority date	Feb 28, 2017
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

This invention relates to a polymer composition which is particularly suitable for use in the manufacture of films having a great ability to disintegrate, preferably at low temperatures, which can be used in the mulch film sector.

First claim

The invention claimed is:

1. A film comprising a composition comprising:
i) 55-80% by weight, with respect to the total weight of the composition, of at least one aliphatic polyester (i) comprising:
a) a dicarboxylic component comprising with respect to the total dicarboxylic component:
a1) 70-100% by moles of units deriving from succinic acid, and
a2) 0-30% by moles of units deriving from at least one saturated dicarboxylic acid different from succinic acid, and

b) a diol component comprising with respect to the total diol component:
b1) 95-100% by moles of units deriving from 1,4-butanediol, and
b2) 0-5% by moles of units deriving from at least one saturated aliphatic diol different from 1,4-butanediol;

ii) 5-40% by weight, with respect to the total weight of the composition, of at least one aliphatic-aromatic polyester (ii) comprising:
a) a dicarboxylic component comprising with respect to the total dicarboxylic component:
a1) 30-70% by moles of units deriving from at least one aromatic dicarboxylic acid, and
a2) 70-30% by moles of units deriving from at least one saturated aliphatic dicarboxylic acid,

b) a diol component comprising with respect to the total diol component:
b1) 95-100% by moles of units deriving from at least one saturated aliphatic diol, and
b2) 0-5% by moles of units deriving from at least one unsaturated aliphatic diol; and

iii) 1-25% by weight, with respect to the total weight of the composition, of at least one polyhydroxyalkanoate,
said film having an impact strength index of at least 2 mJ/(g/m 2 ), measured according to standard ASTM D3420-08a.

2. The film according to claim 1 , wherein the composition comprises:
i)60-80% by weight, with respect to the total weight of the composition, of at least one aliphatic polyester (i),
ii) 5-30% by weight, with respect to the total weight of the composition, of at least one aliphatic-aromatic polyester (ii), and
iii) 1-25% by weight, with respect to the total weight of the composition, of at least one polyhydroxyalkanoate (iii).

3. The film according to claim 1 , wherein the composition comprises:
i) 60-80% by weight, with respect to the total weight of the composition, of at least one aliphatic polyester (i),
ii) 16-30% by weight, with respect to the total weight of the composition, of at least one aliphatic-aromatic polyester (ii), and
iii) 1-20% by weight, with respect to the total weight of the composition, of at least one polyhydroxyalkanoate (iii).

4. The film according to claim 1 , wherein the dicarboxylic component a2) of the aliphatic polyester (i) is selected from the group consisting of adipic acid, azelaic acid, sebacic acid and mixtures thereof.

5. The film according to claim 1 , wherein the diol component of the aliphatic polyester (i) is 1,4-butanediol.

6. The film according to claim 1 , wherein the aromatic dicarboxylic acid a1) of the aliphatic-aromatic polyester (ii) is selected from aromatic dicarboxylic acids of the type of phthalic acid and heterocyclic dicarboxylic aromatic compounds, their esters, salts and mixtures.

7. The film according to claim 1 , wherein the aromatic dicarboxylic acid a1) of the aliphatic-aromatic polyester (ii) is selected from terephthalic acid and their esters and salts, 2,5-furandicarboxylic acid and their esters and salts, and mixtures thereof.

8. The film according to claim 1 , wherein the aliphatic dicarboxylic acid a2) of the aliphatic-aromatic polyester (ii) is selected from the group consisting of succinic acid, adipic acid, azelaic acid, sebacic acid, brassylic acid and mixtures thereof.

9. The film according to claim 1 , wherein the aliphatic dicarboxylic acid a2) of the aliphatic-aromatic polyester (ii) is selected from adipic acid and azelaic acid.

10. The film according to claim 1 , wherein the polyhydroxyalkanoate (iii) is selected from the group consisting of polyesters of lactic acid, poly-ε-caprolactone, polyhydroxybutyrate, polyhydroxybutyrate-valerate, polyhydroxybutyrate propanoate, polyhydroxybutyrate-hexanoate, polyhydroxybutyrate-decanoate, polyhydroxybutyrate-dodecanoate, polyhydroxybutyrate-hexadecanoate, polyhydroxybutyrate-octadecanoate, poly 3-hydroxybutyrate 4-hydroxybutyrate and mixtures thereof.

11. The film according to claim 1 , wherein the composition comprises 0-5% by weight, with respect to the total weight of the composition, of at least one cross-linking agent and/or chain extender comprising at least one compound having two and/or multiple functional groups including groups selected from isocyanate, peroxide, carbodiimide, isocyanurate, oxazoline, epoxide, anhydride, divinyl ether and mixtures thereof.

12. The film according to claim 11 , wherein the cross-linking agent and/or chain extender comprises compounds including epoxide groups of the styrene-glycidyl ether-methylmethacrylate type.

13. The film according to claim 1 , wherein the composition comprises 0-30% by weight, with respect to the total weight of the composition, of at least one filler.

14. The film according to claim 1 for manufacturing mulch films.

15. A mulch film comprising the film according to claim 1 .

16. The film according to claim 2 , wherein the composition comprises:
i) 60-80% by weight, with respect to the total weight of the composition, of at least one aliphatic polyester (i),
ii) 16-30% by weight, with respect to the total weight of the composition, of at least one aliphatic-aromatic polyester (ii), and
iii) 1-20% by weight, with respect to the total weight of the composition, of at least one polyhydroxyalkanoate (iii).

17. The film according to claim 2 , wherein the dicarboxylic component a2) of the aliphatic polyester (i) is selected from the group consisting of adipic acid, azelaic acid, sebacic acid and mixtures thereof.

18. The film according to claim 3 , wherein the dicarboxylic component a2) of the aliphatic polyester (i) is selected from the group consisting of adipic acid, azelaic acid, sebacic acid and mixtures thereof.

19. The film according to claim 2 , wherein the diol component of the aliphatic polyester (i) is 1,4-butanediol.

20. The film according to claim 3 , wherein the diol component of the aliphatic polyester (i) is 1,4-butanediol.

Assignees

• Novamont Spa

Inventors

• Gesti Garcia Sebastia
• Tettoni Giovanni

Classifications

• C08G63/06

  derived from hydroxycarboxylic acids · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08J2467/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08J2467/06 takes precedence) · CPC title